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The only scoped variables I am able to access this way are flow conversation and flash scoped variables. I suspect this is because they are backed by http session. The get nothing for variables in other scopes.

I have been unable to find any documentation that says that variables in the different scopes are made available to JSP's this way. Have you seen where this behavior is documented?

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Essentially, when the HTML page generated by your JSP 'submit's back to the webflow system, it takes the input variables from the form (present in the POST) and sets their values back to your model object.

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The radio button should have a name and a value associated with it. The name should map to a property on your model object, and the value is what's assigned to that if the user selects it prior to submit.

Seriously, look at the webflow samples because there's an example of this in there.

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For example, the 'Search Criteria' facility uses radio buttons to select the page size for the search (in the booking-mvc example). Take a look at the model object SearchCriteria.java and the searchForm.jsp which binds to it.